package com.qxf.util.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CharacterFilter implements Filter {

	private String encoding = null;
	
	@Override
	public void destroy() {
		this.encoding = null;
	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)resp;
		if(this.encoding != null && this.encoding.length() > 0) {
			request.setCharacterEncoding(this.encoding);
			response.setCharacterEncoding(this.encoding);
		} else {
			request.setCharacterEncoding("UTF-8");
			response.setCharacterEncoding("UTF-8");
		}
		chain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		this.encoding = config.getInitParameter("encoding");
	}

}
